Seems like the miners squished out every little hash rate left in their miners yesterday, reaching an ATH at the day of the halving:
Bitcoin Hashrate All Time High May 11, 2020: 149.72 EH/s Currently we are estimated to be down with about 21% after the halving. Lets monitor how this evolves, no 'minder dead spiral' yet it seems.
Current Bitcoin Hashrate: 118.64 EH/s Hashrate found a local bottom yesterday at 82.11 EH/s, a decline of 45% from the ATH on the day of the halving.
Current hashrate is back to 103.24 EH/S, up 26% from yesterday's bottom, and -31% from the ATH. Nothing unexpected so far, currently back to May 9 2020 levels (!).
The hashrate is calculated based in the difficulty and the time to find a block, which is short term rather volatile.